.index {
    font-family: "Avenir", Helvetica, Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-align: center;
}

.submit-age {
    margin: 100px 100px;
}
.submit-btn {
    width: 400px;
    height: 400px;
    border-radius: 50%;
    margin-top: 400px;
    font-size: 80px;
}
